ORIGINS OF AGAMIC PATTERNS 



619 



coinciding with the axis of the antheridial filament.^ In this development 

 several points of interest as regards pattern appear. As regards direction 



B 



Fig. 196, A-E. — Plant spermatozoids. A, Chara (after Belajeff, 1894); B, C, D, stages in 

 development of Eqtiisetum spermatozoid (after Sharp, 191 2); E, spermatozoid of fern, Ne- 

 phr odium (from Yamanouchi, 1908). 



of nuclear movement toward one side of the cell, both Belajeff and Mottier 

 give figures in which nuclei of successive cells of a filament have evidently 

 moved in the same direction, as if reacting to some factor external to the 



* Belajeff, 1894; Mottier, 1904. 



